Ink composition for organic light emitting device

ABSTRACT

The present invention relates to an ink composition for an organic light emitting device that can be applied to an inkjet process. When the inkjet process is applied using this, it is possible to form a film having smooth and flat surfaces when dried after forming an ink film.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a national phase entry under 35 U.S.C. § 371 ofInternational Application No. PCT/KR2019/010789 filed Aug. 23, 2019,which claims priority from Korean Patent Application No. 10-2018-0103831filed Aug. 31, 2018, all of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to an ink composition for an organic lightemitting device that can be applied to an inkjet process.

BACKGROUND ART

In general, an organic light emitting phenomenon refers to a phenomenonwhere electric energy is converted into light energy by using an organicmaterial. The organic light emitting device using the organic lightemitting phenomenon has characteristics such as a wide viewing angle, anexcellent contrast, a fast response time, an excellent luminance,driving voltage and response speed, and thus many studies haveproceeded.

The organic light emitting device generally has a structure including ananode, a cathode, and an organic material layer interposed between theanode and the cathode. The organic material layer frequently has amultilayered structure that includes different materials in order toenhance efficiency and stability of the organic light emitting device,and for example, the organic material layer may be formed of a holeinjection layer, a hole transport layer, a light emitting layer, anelectron transport layer, an electron injection layer and the like. Inthe structure of the organic light emitting device, if a voltage isapplied between two electrodes, the holes are injected from an anodeinto the organic material layer and the electrons are injected from thecathode into the organic material layer, and when the injected holes andelectrons meet each other, an exciton is formed, and light is emittedwhen the exciton falls to a ground state again.

Meanwhile, recently, in order to reduce process costs, an organic lightemitting device using a solution process, particularly an inkjetprocess, has been developed instead of a conventional depositionprocess. In the initial stage of development, attempts have been made todevelop organic light emitting devices by coating all organic lightemitting device layers by a solution process, but current technology haslimitations. Therefore, only HIL, HTL, and EML are processed in a layerdevice structure by a solution process, and a hybrid process utilizingtraditional deposition processes is being studied as a subsequentprocess.

Since the ink composition used in the inkjet process should have gooddischarge characteristics, it is necessary to use a solvent having ahigh boiling point. When using a solvent having a low boiling point, anozzle part of an inkjet head may be clogged and there is a possibilitythat initial jetting properties are not good or meandering occurs. Inaddition, when the ink is filled and dried in a bank, which is a spacewhere the ink composition is discharged, the ink film should be flatlyfilled in the bank without any step and the ink film surface should besmooth. However, when the solubility of a material in a solvent is poor,or when the material and the solvent do not match each other, in theprocess where the solvent is quickly dried (e.g., vacuum dried),precipitation occurs or surface characteristics (film image) aredeteriorated. In order to solve the above problems, a solvent to be usedmust be appropriately selected according to the functional materialcontained in the ink composition. It is often difficult to solve boththe film image and the film flatness only by selecting a solvent.

Therefore, in the present invention, the above problems are solved byusing an additional additive in addition to the functional material andthe solvent, as described below.

PRIOR ART LITERATURE Patent Literature

(Patent Literature 0001) Korean Patent Laid-open Publication No.10-2000-0051826

DETAILED DESCRIPTION OF THE INVENTION Technical Problem

It is an object of the present invention to provide an ink compositionfor an organic light emitting device that can be applied to an inkjetprocess.

Technical Solution

In order to achieve the above object, one embodiment of the presentinvention provides an ink composition for an organic light emittingdevice including a compound represented by the following ChemicalFormula 1, a compound represented by the following Chemical Formula 2,and a solvent

in Chemical Formula 1,

L and L₁ to L₄ are each independently a substituted or unsubstitutedC₆₋₆₀ arylene,

Ar₁ and Ar₂ are each independently a substituted or unsubstituted C₆₋₆₀aryl; or a substituted or unsubstituted C₂₋₆₀ heteroaryl containing oneor more heteroatoms selected from the group consisting of N, O and S,

R₁ to R₄ are each independently hydrogen, deuterium, a substituted orunsubstituted C₁₋₆₀ alkyl, a substituted or unsubstituted C₁₋₆₀ alkoxy,a substituted or unsubstituted C₆₋₆₀ aryl, or a substituted orunsubstituted C₂₋₆₀ heteroaryl containing one or more heteroatomsselected from the group consisting of N, O and S,

Y₁ to Y₄ are each independently hydrogen, or —X-A, with the proviso thattwo or more of Y₁ to Y₄ are —X-A,

X is O or S,

A is a functional group which can be crosslinked by heat or light,

n1 and n4 are each an integer of 0 to 4,

n2 and n3 are each an integer of 0 to 3,

in Chemical Formula 2,

R is C₃₋₆₀ alkyl; C₃₋₆₀ alkenyl; or phenyl substituted with C₃₋₆₀ alkyl,and

n is an integer of 4 to 20.

Advantageous Effects

The ink composition for forming an organic light emitting deviceaccording to the present invention can form a film having smooth andflat surfaces, when dried after forming an ink film by an inkjetprocess.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically shows a method of discharging ink to a pixelaccording to an experimental example of the present invention.

FIG. 2 shows an example in which a film image is evaluated as O.Kaccording to an experimental example of the present invention.

FIG. 3 shows an example in which a film image is evaluated as N.Gaccording to an experimental example of the present invention.

FIG. 4 schematically shows a method for measuring a film flatnessaccording to an experimental example of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, embodiments of the present invention will be described inmore detail to facilitate understanding of the invention.

Definition of Terms

As used herein, the notation

means a bond linked to another substituent group.

As used herein, the term “unsubstituted or substituted” means beingunsubstituted or substituted with one or more substituents selected fromthe group consisting of deuterium; a halogen group; a nitrile group; anitro group; a hydroxy group; a carbonyl group; an ester group; an imidegroup; an amino group; a phosphine oxide group; an alkoxy group; anaryloxy group; an alkylthioxy group; an arylthioxy group; analkylsulfoxy group; an arylsulfoxy group; a silyl group; a boron group;an alkyl group; a cycloalkyl group; an alkenyl group; an aryl group; anaralkyl group; an aralkenyl group; an alkylaryl group; an alkylaminegroup; an aralkylamine group; a heteroarylamine group; an arylaminegroup; an arylphosphine group; or a heterocyclic group containing atleast one of N, O and S atoms, or being unsubstituted or substitutedwith a substituent to which two or more substituents are linked amongthe substituents exemplified above. For example, “the substituent towhich two or more substituents are linked” may be a biphenyl group. Thatis, the biphenyl group may also be an aryl group and may be interpretedas a substituent to which two phenyl groups are linked.

In the present specification, the number of carbon atoms of a carbonylgroup is not particularly limited, but is preferably 1 to 40.Specifically, the carbonyl group may be a compound having the followingstructural formulas, but is not limited thereto.

In the present specification, an ester group may have a structure inwhich oxygen of the ester group may be substituted by a straight-chain,branched-chain, or cyclic alkyl group having 1 to 25 carbon atoms, or anaryl group having 6 to 25 carbon atoms. Specifically, the ester groupmay be a compound having the following structural formulas, but is notlimited thereto.

In the present specification, the number of carbon atoms of an imidegroup is not particularly limited, but is preferably 1 to 25.Specifically, the imide group may be a compound having the followingstructural formulas, but is not limited thereto.

In the present specification, a silyl group specifically includes atrimethylsilyl group, a triethylsilyl group, a t-butyldimethylsilylgroup, a vinyldimethylsilyl group, a propyldimethylsilyl group, atriphenylsilyl group, a diphenylsilyl group, a phenylsilyl group and thelike, but is not limited thereto.

In the present specification, a boron group specifically includes atrimethylboron group, a triethylboron group, a t-butyldimethylborongroup, a triphenylboron group, and a phenylboron group, but is notlimited thereto.

In the present specification, examples of a halogen group includefluorine, chlorine, bromine, or iodine.

In the present specification, the alkyl group may be straight-chain orbranched-chain, and the number of carbon atoms thereof is notparticularly limited, but is preferably 1 to 40. According to oneembodiment, the number of carbon atoms of the alkyl group is 1 to 20.According to another embodiment, the number of carbon atoms of the alkylgroup is 1 to 10. According to another embodiment, the number of carbonatoms of the alkyl group is 1 to 6. Specific examples of the alkyl groupinclude methyl, ethyl, propyl, n-propyl, isopropyl, butyl, n-butyl,isobutyl, tert-butyl, sec-butyl, 1-methyl-butyl, 1-ethyl-butyl, pentyl,n-pentyl, isopentyl, neopentyl, tert-pentyl, hexyl, n-hexyl,1-methylpentyl, 2-methylpentyl, 4-methyl-2-pentyl, 3,3-dimethylbutyl,2-ethylbutyl, heptyl, n-heptyl, 1-methylhexyl, cyclopentylmethyl,cyclohexylmethyl, octyl, n-octyl, tert-octyl, 1-methylheptyl,2-ethylhexyl, 2-propylpentyl, n-nonyl, 2,2-dimethylheptyl,1-ethyl-propyl, 1,1-dimethyl-propyl, isohexyl, 2-methylpentyl,4-methylhexyl, 5-methylhexyl, and the like, but are not limited thereto.

In the present specification, the alkenyl group may be straight-chain orbranched-chain, and the number of carbon atoms thereof is notparticularly limited, but is preferably 2 to 40. According to oneembodiment, the number of carbon atoms of the alkenyl group is 2 to 20.According to another embodiment, the number of carbon atoms of thealkenyl group is 2 to 10. According to still another embodiment, thenumber of carbon atoms of the alkenyl group is 2 to 6. Specific examplesthereof include vinyl, 1-propenyl, isopropenyl, 1-butenyl, 2-butenyl,3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 3-methyl-1-butenyl,1,3-butadienyl, allyl, 1-phenylvinyl-1-yl, 2-phenylvinyl-1-yl,2,2-diphenylvinyl-1-yl, 2-phenyl-2-(naphthyl-1-yl)vinyl-1-yl,2,2-bis(diphenyl-1-yl)vinyl-1-yl, a stilbenyl group, a styrenyl group,and the like, but are not limited thereto.

In the present specification, a cycloalkyl group is not particularlylimited, but the number of carbon atoms thereof is preferably 3 to 60.According to one embodiment, the number of carbon atoms of thecycloalkyl group is 3 to 30. According to another embodiment, the numberof carbon atoms of the cycloalkyl group is 3 to 20. According to stillanother embodiment, the number of carbon atoms of the cycloalkyl groupis 3 to 6. Specific examples thereof include cyclopropyl, cyclobutyl,cyclopentyl, 3-methylcyclopentyl, 2,3-dimethylcyclopentyl, cyclohexyl,3-methylcyclohexyl, 4-methylcyclohexyl, 2,3-dimethylcyclohexyl,3,4,5-trimethylcyclohexyl, 4-tert-butylcyclohexyl, cycloheptyl,cyclooctyl, and the like, but are not limited thereto.

In the present specification, an aryl group is not particularly limited,but preferably has 6 to 60 carbon atoms, and it may be a monocyclic arylgroup or a polycyclic aryl group. According to one embodiment, thenumber of carbon atoms of the aryl group is 6 to 30. According to oneembodiment, the number of carbon atoms of the aryl group is 6 to 20. Thearyl group may be a phenyl group, a biphenyl group, a terphenyl group orthe like as the monocyclic aryl group, but is not limited thereto.Examples of the polycyclic aryl group include a naphthyl group, ananthracenyl group, a phenanthryl group, a pyrenyl group, a perylenylgroup, a chrysenyl group, a fluorenyl group or the like, but is notlimited thereto.

In the present specification, a fluorenyl group may be substituted, andtwo substituent groups may be connected with each other to form a spirostructure. In the case where the fluorenyl group is substituted,

and the like can be formed. However, the structure is not limitedthereto.

In the present specification, a heterocyclic group is a heterocyclicgroup including one or more of O, N, Si and S as a heteroatom, and thenumber of carbon atoms thereof is not particularly limited, but ispreferably 2 to 60. Examples of the heterocyclic group include athiophene group, a furan group, a pyrrole group, an imidazole group, athiazole group, an oxazol group, an oxadiazol group, a triazol group, apyridyl group, a bipyridyl group, a pyrimidyl group, a triazine group,an acridyl group, a pyridazine group, a pyrazinyl group, a quinolinylgroup, a quinazoline group, a quinoxalinyl group, a phthalazinyl group,a pyridopyrimidinyl group, a pyridopyrazinyl group, a pyrazinopyrazinylgroup, an isoquinoline group, an indole group, a carbazole group, abenzoxazole group, a benzimidazole group, a benzothiazol group, abenzocarbazole group, a benzothiophene group, a dibenzothiophene group,a benzofuranyl group, a phenanthroline group, an isoxazolyl group, athiadiazolyl group, a phenothiazinyl group, a dibenzofuranyl group, andthe like, but are not limited thereto.

In the present specification, the aryl group in the aralkyl group, thearalkenyl group, the alkylaryl group, and the arylamine group is thesame as the aforementioned examples of the aryl group. In the presentspecification, the alkyl group in the aralkyl group, the alkylaryl groupand the alkylamine group is the same as the aforementioned examples ofthe alkyl group. In the present specification, the heteroaryl in theheteroarylamine can be applied to the aforementioned description of theheterocyclic group. In the present specification, the alkenyl group inthe aralkenyl group is the same as the aforementioned examples of thealkenyl group. In the present specification, the aforementioneddescription of the aryl group may be applied except that the arylene isa divalent group. In the present specification, the aforementioneddescription of the heterocyclic group can be applied except that theheteroarylene is a divalent group. In the present specification, theaforementioned description of the aryl group or cycloalkyl group can beapplied except that the hydrocarbon ring is not a monovalent group butformed by combining two substituent groups. In the presentspecification, the aforementioned description of the heterocyclic groupcan be applied, except that the heterocycle is not a monovalent groupbut formed by combining two substituent groups.

Compound Represented by Chemical Formula 1

The compound represented by Chemical Formula 1 is a materialconstituting a functional layer in the organic light emitting device. Byincluding oxygen (O) or sulfur (S) atoms in the compound, it is possibleto form a stable thin-film completely cured by heat treatment or UVtreatment. In addition, it has high affinity with solvents and thus hassolvent selectivity (orthogonality). Moreover, it has a resistance tothe solvent used when forming another layer by a solution process, inaddition to the organic material layer containing the above compound,and thus can prevent movement to another layer. In addition, the theorganic light emitting device including the same can have low drivingvoltage, high light emitting efficiency and high lifetimecharacteristics.

Preferably, A is any one selected from the group consisting of thefollowing:

wherein,

T₁ is hydrogen or a substituted or unsubstituted C₁₋₆₀ alkyl, and

T₂ to T₄ are each independently a substituted or unsubstituted C₁₋₆alkyl.

Preferably, the Chemical Formula 1 is represented by any one of thefollowing Formulas 1-1 to 1-4:

in Chemical Formulas 1-1 to 1-4,

R₁ to R₄, n1 to n4, Ar₁, Ar₂ and L are as previously defined in ChemicalFormula 1,

X₁ to X₄ are each independently O or S,

A₁ to A₄ are each independently a functional group that can becrosslinked by heat or light,

R₂₁ to R₂₆ are each independently hydrogen, deuterium, a substituted orunsubstituted C₁₋₆₀ alkyl, a substituted or unsubstituted C₁₋₆₀ alkoxy,a substituted or unsubstituted C₆₋₆₀ aryl, or a substituted orunsubstituted C₂₋₆₀ heteroaryl containing any one or more heteroatomsselected from the group consisting of N, O and S, and

p1 and p2 are each an integer of 0 to 5,

p3 and p4 are each an integer of 0 to 4,

p5 and p6 are each an integer of 0 to 7.

Preferably, L is the following Chemical Formula 1-A or 1-B:

in Chemical Formulas 1-A and 1-B,

R₁₁ to R₁₃ are each independently hydrogen, deuterium, a substituted orunsubstituted C₁₋₆₀ alkyl, a substituted or unsubstituted C₁₋₆₀ alkoxy,a substituted or unsubstituted C₆₋₆₀ aryl, or a substituted orunsubstituted C₂₋₆₀ heteroaryl containing any one or more heteroatomsselected from the group consisting of N, O and S, and

m1 to m3 are each an integer of 0 to 4.

Representative examples of the compound represented by Chemical Formula1 are as follows:

On the other hand, the compound represented by Chemical Formula 1 may beprepared by the preparation method as shown in the following ReactionScheme 1.

In Reaction Scheme 1, the remaining definitions excluding X′ are asdefined above, and X′ is halogen, preferably bromo, or chloro. ReactionScheme 1 is an amine substitution reaction, which is preferably carriedout in the presence of a palladium catalyst and a base, and a reactivegroup for the amine substitution reaction can be modified as known inthe art. The above preparation method may be further specified inPreparation Examples described hereinafter.

On the other hand, the coating composition according to the presentinvention further includes a p-type doping material in addition to thecompound represented by Chemical Formula 1. The p-type doping materialrefers to a material that enables a host material to have p-typesemiconductor properties. The p-type semiconductor properties refer toproperties such that holes are injected or transported through thehighest occupied molecular orbital (HOMO) energy level, that is,properties of a material having high hole conductivity.

Preferably, the p-type doping material may be represented by any one ofthe following Chemical Formulas A to H.

Preferably, the content of the p-type doping material is 0% by weight to50% by weight relative to the compound represented by Chemical Formula1.

Compound Represented by Chemical Formula 2

A functional layer may be formed by a solution process using thecompound represented by Chemical Formula 1, but recently, among thesolution process, an inkjet printing process is most frequently studied.Since the inkjet printing process discharges fine drops, there is anadvantage that not only the consumption of materials can be minimizedbut also precise patterns are possible.

In the inkjet process, the ink is discharged to pixel parts and then thesolvent is dried to form an intended functional layer. In this process,it is difficult to form a flat film (excellent in film flatness) with afew steps in pixels while having a smooth surface (excellent in filmimage). In other words, some inks have excellent film flatness, such asshowing a few steps in pixels, but large film surface roughness may showor problems such as precipitation may occur, and thus, poor film imagemay show. On the contrary, the film image is excellent, but a filmflatness may appear poor, for example, the ink film climbs up a bankwall or the center of the pixel is convex. In other words, it is oftenvery difficult to find a solvent that satisfies both conditions.

However, the present invention further includes a compound representedby Chemical Formula 2 so that the above-described problem does not occureven when the compound represented by Chemical Formula 1 is applied tothe inkjet process.

Although not limited by a specific theory, the compound represented byChemical Formula 2 has a hydrophilic group and a hydrophobic group atthe same time, and thus, in the process of vacuum drying the compoundrepresented by Chemical Formula 1, it adjusts an interaction between thesolvent and the material so that a flat layer is formed after drying.

Preferably, R is C₁₀₋₂₀ alkyl; C₁₀₋₂₀ alkenyl; or phenyl substitutedwith C₁₀₋₂₀ alkyl.

The compound represented by Chemical Formula 2 may be prepared directlyor purchased commercially, and representative examples include Brij®C10, Brij® S10, Brij® 010, IGEPAL® CO-520, IGEPAL® CO-630, Triton®X-100, Triton® X-114, Triton® X-45 and the like.

On the other hand, the compound represented by Chemical Formula 2 ispreferably included in an amount of 0.05 to 1% by weight relative to thetotal weight of the ink composition according to the present invention.When the content is less than 0.05% by weight, the effect due to theaddition of the compound represented by Chemical Formula 2 isinsignificant, and when the content exceeds 1% by weight, not only theeffect due to the addition is not substantially increased, but alsorather, there is a risk of hindering the luminous efficiency andlifetime of the organic light emitting device.

Solvent

The solvent used in the present invention is a solvent that dissolvesthe compound represented by Chemical Formula 1 and the compoundrepresented by Chemical Formula 2 and that is used in an inkjet process.In addition, when the p-type doping material mentioned above is used, itis a solvent that can dissolve this material together.

Since the inkjet process discharges fine droplets of ink via an inkjethead, the discharge stability at the head (straightness, nonon-discharge, good initial jetting properties, etc.) is important.Thus, it is important to maintain so that the solution is not dried at anozzle portion. When the ink is dried at the nozzle portion, problemssuch as nozzles being clogged and ink being discharged into a crooked orzigzag shape (meandering) may occur, but in order to prevent theseproblems, a solvent having a high boiling point is generally used.

The solvent has a boiling point of preferably 180° C. or more, morepreferably 190° C. or more, and most preferably 200° C. or more. On theother hand, the upper limit of the boiling point is not particularlylimited. However, when the boiling point is too high, it is difficult todry the solvent. Thus, for example, the boiling point is 400° C. orlower, preferably 350° C. or lower.

The solvent may be used without limitation as long as it is a solventhaving a high boiling point and can dissolve the material of thefunctional layer well. It may be a single solvent or a mixed solventcomposition. Among them, in the case of including the solvents below,the effect of the additive can be further maximized, and examplesthereof include aliphatic esters, aromatic esters, aliphatic ethers,aromatic ethers, aliphatic hydrocarbons, aromatic hydrocarbons,aliphatic alcohols, aromatic alcohols, or glycol ethers.

Preferably, the solvent is represented by the following Chemical Formula3:

in Chemical Formula 3,

R′ is hydrogen, C₁₋₅ alkyl, or C₆₋₆₀ aryl,

R″ is C₁₋₁₀ alkyl, C₁₋₁₀ alkoxy, hydroxy, or —COO— (C₁₋₁₀ alkyl), and nis an integer of 1 to 6.

The compound represented by Chemical Formula 3 is a glycol ether-basedsolvent and has low surface tension, which is advantageous for forming aflat layer.

Typical examples of the solvent include triethylene glycol monobutylether, diethylene glycol dibutyl ether, tetraethylene glycol dimethylether, tetraethylene glycol n-butyl ether, triethylene glycolmonoisopropyl ether, diethylene glycol monohexyl ether, triethyleneglycol monomethyl ether, diethylene glycol monobutyl ether acetate,diethylene glycol monoisobutyl ether, dipropylene glycol n-butyl etherand the like.

In addition, there may be mentioned 3-pheoxytoluene, dibenzyl ether,bis(methoxymethyl)benzene, isoamylbenzoate, isoamyl octanoate,decylbenzene, 1-methoxynaphthalene, phenethyl octanoate,1,3-dimethoxybenzene, ethyl 4-methoxybenzoate, hexyl benzoate,1-ethylnaphthalene, cyclohexylbenzene, octylbenzene, 2-ethylnaphthalene,benzyl butyrate, p-anisaldehyde dimethyl acetal, 3-phenyl-1-propanol,p-propylanisole, ethyl benzoate, butyl phenyl ether,3,4-dimethylanisole, ethylene glycol monobenzyl ether, diethylene glycolmonophenyl ether, dibutyl oxalate, 3-phenoxybenzyl alcohol and the like.

Ink Composition

The ink composition according to the present invention described abovecan be used for the preparation of a functional layer of an organiclight emitting device. The ink composition may be used to prepare afunctional layer of an organic light emitting device by a solutionprocess, and in particular, it may be applied to an inkjet process.

The inkjet process may use a method used in the art, except for usingthe ink composition according to the present invention described above.As an example, the process may include a step of discharging the inkcomposition to form an ink film; and a step of drying the ink film.Moreover, since the compound represented by Chemical Formula 1 includesa functional group that can be crosslinked by heat or light, it mayfurther include a step of performing heat treatment or light treatmentafter the above steps.

Meanwhile, the functional layer which may be formed of the inkcomposition may be a hole injection layer, a hole control (transport)layer and a light emitting layer of the organic light emitting device.Moreover, since the structure and manufacturing method of the organiclight emitting device used in the art can be applied except for thefunctional layer, a detailed description will be omitted herein.

Hereinafter, preferred examples are provided to facilitate understandingof the present invention. However, the following examples are merelyprovided for a better understanding of the present invention, and thescope of the present invention is not limited thereby.

PREPARATION EXAMPLE Preparation Example 1: Preparation of Compound 1

1) Preparation of Intermediate 1-1

2-Bromo-9-phenyl-9H-fluorene-9-ol (50 g, 148.3 mmol, 1.0 eq) and phenol(41.8 g, 444.9 mmol, 3.0 eq) were added to a 500-ml round flask anddissolved in methanesulfonic acid (200 ml, 0.74 M). The mixture wasstirred at reflux overnight. Subsequently, the reaction was stopped witha saturated NaHCO₃ aqueous solution, and then the organic layer wasextracted with ethyl acetate. The organic layer was dried over magnesiumsulfate and then the solvent was removed and purified by columnchromatography to obtain Intermediate Compound 1-1.

2) Preparation of Intermediate 1-2

Intermediate 1-1 (30 g, 63.9 mmol, 1.0 eq) and cesium carbonate (41.6 g,127.8 mmol, 2.0 eq) were dissolved in DMF (120 ml, 0.5 M) in a 500-mlround flask and then heated to 50° C. and stirred. Then, 4-vinylbenzylchloride (9.15 ml, 9.75 g, 1.0 eq) was added thereto and stirred at 60°C. After cooling to room temperature, water was added to stop thereaction. The organic layer was then extracted using ethyl acetate. Theorganic layer was separated, dried over magnesium sulfate, and thesolvent was removed and purified by column chromatography to obtainIntermediate Compound 1-2.

3) Preparation of Compound 1

Intermediate 1-2 (12.0 g, 20.49 mmol, 2.05 eq),N4,N4′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (3.36 g, 10.0 mmol, 1.0eq), NaOtBu (3.36 g, 34.99 mmol, 3.5 eq), and Pd(PtBu₃)₂ (255 mg, 0.5mmol, 0.05 eq) were dissolved in toluene (100 ml) in a 250-ml roundflask, then stirred and reacted under a nitrogen atmosphere.Subsequently, after completion of the reaction, it was worked-up withwater and ethyl acetate, and the organic layer was separated, dried andthen filtered. Subsequently, the solvent was removed with a rotaryvacuum evaporator. The resulting crude material was purified by columnchromatography and the solvent was removed to obtain Compound 1 (whitesolid).

1H NMR (500 MHz): δ 8.00-7.82 (m, 4H), 7.70-7.68 (d, 4H), 7.62-7.55 (m,6H), 7.35-7.15 (m, 38H), 7.05-7.03 (t, 2H), 6.92-9.85 (d, 4H), 6.73-6.70(m, 2H), 5.76-5.73 (d, 2H), 5.39-5.37 (d, 2H), 5.17 (s, 4H)

Preparation Example 2: Preparation of Compound 2

1) Preparation of Intermediate 2-1

4-(2-Bromo-9-(4-(tert-butyl)phenyl)-9H-fluoren-9-yl)phenol (50 g, 106.50mmol, 1.0 eq), 4-bromobenzaldehyde (23.6 g, 127.8 mmol, 1.2 eq) andpotassium carbonate (44.2 g, 319.50 mmol, 3.0 eq) were added to a 500-mlround flask and dissolved in dry pyridine (200 ml, 0.5 M). Then,copper(II) oxide (17.0 g, 213.0 mmol, 2 eq) was added slowly and heatedto 120° C., and the reaction allowed to proceed under reflux. When thereaction was completed, the reaction was stopped with saturated aqueousNaHCO₃ solution and the organic layer was extracted with ethyl acetate.The organic layer was dried with magnesium sulfate to remove thesolvent, and the resulting crude material was dissolved indichloromethane and precipitated with ethanol to obtain IntermediateCompound 2-1 as a solid.

2) Preparation of Intermediate 2-2

Anhydrous tetrahydrofuran (50 ml, 0.2 M) was added to a round flaskcontaining methyltriphenylphosphonium bromide (12.46 g, 34.87 mmol, 2.0eq) and the round flask was immersed in an ice bath. Potassiumtert-butoxide (3.9 g, 34.87 mmol, 2.0 eq) was added in one portion andstirred in an ice bath for 20 minutes. Intermediate compound 2-1 (10.0g, 17.44 mmol, 1.0 eq) was dissolved in tetrahydrofuran (30 ml) and thengradually added to the mixture using a dropping funnel. Then, the roundflask and the funnel were rinsed with tetrahydrofuran (10 ml) and putthereto. Water (50 ml) was added to terminate the reaction, and theorganic layer was extracted with ethyl acetate. The organic layer wasdried with magnesium sulfate, and then the solvent was removed andpurified by column chromatography to obtain Compound 2-2.

3) Preparation of Compound 2

Intermediate Compound 2-2 (10.0 g, 17.50 mmol, 2.05 eq),N4,N4′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (2.87 g, 8.53 mmol, 1.0eq), NaOtBu (2.87 g, 29.86 mmol, 3.5 eq) and Pd(PtBu₃)₂ (218.0 mg, 0.43mmol, 0.05 eq) were dissolved in toluene (90 ml) in a 250-ml roundflask, then stirred and reacted under a nitrogen atmosphere.Subsequently, after completion of the reaction, it was worked-up withwater and ethyl acetate, and the organic layer was separated, dried andthen filtered. Then, the solvent was removed with a rotary vacuumevaporator. The resulting crude material was purified by columnchromatography and the solvent was removed to obtain Compound 2 (whitesolid).

1H NMR (500 MHz): b 7.95-7.83 (m, 4H), 7.65-7.58 (m, 10H), 7.54-7.26 (m,22H), 7.24-7.05 (m, 12H), 6.95-6.93 (d, 4H), 6.86-6.84 (d, 4H),6.80-6.76 (m, 2H), 5.65-5.61 (d, 2H), 5.16-5.13 (d, 2H), 1.35 (s, 18H)

Preparation Example 3: Preparation of Compound 3

1) Preparation of Intermediate 3-1

4-(2-Bromo-9-(p-tolyl)-9H-fluoren-9-yl)phenol (15 g, 35.1 mmol, 1.0 eq),potassium carbonate (14.6 g, 105.3 mmol, 3 eq), copper(I) iodide (334.3mg, 1.76 mmol, 0.05 eq) and 1-butylimidazole (4.4 g, 35.1 mmol, 1.0 eq)were added to a 250-ml round flask and dissolved in toluene (175 ml).After the reflux apparatus was installed, the mixture was heated to 120°C. and the reaction allowed to proceed under stirring. When the reactionwas completed, the reaction was stopped with saturated aqueous NaHCO₃solution and worked up with water and ethyl acetate. The organic layerwas separated, dried over MgSO₄ and filtered. Subsequently, the solventwas removed with a rotary vacuum evaporator. The resulting crudematerial was purified by column chromatography to obtain Compound 3-1.

2) Preparation of Compound 3

Intermediate Compound 3-1 (10.0 g, 18.89 mmol, 2.05 eq),N4,N4′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (3.10 g, 9.21 mmol, 1.0eq), NaOtBu (3.10 g, 32.24 mmol, 3.5 eq) and Pd(PtBu₃)₂ (235.1 mg, 0.46mmol, 0.05 eq) were dissolved in toluene (120 ml) in a 250-ml roundflask, then stirred and reacted under a nitrogen atmosphere.Subsequently, after completion of the reaction, it was worked-up withwater and ethyl acetate, and the organic layer was separated, dried andthen filtered. Then, the solvent was removed with a rotary vacuumevaporator. The resulting crude material was purified by columnchromatography and the solvent was removed to obtain Compound 3 (whitesolid).

1H NMR (500 MHz): δ 7.90-7.87 (m, 4H), 7.56-7.53 (m, 6H), 7.48-7.30 (m,16H), 7.27 (s, 2H), 7.25-7.22 (d, 4H), 7.20-7.15 (m, 18H), 7.14-7.12 (d,4H), 2.88 (s, 8H), 2.19 (s, 6H)

Preparation Example 4: Preparation of Compound 4

1) Preparation of Intermediate 4-1

4,4′-(2-Bromo-9H-fluorene-9,9-diyl)diphenol (10 g, 23.3 mmol, 1.0 eq),potassium carbonate (9.7 g, 69.9 mmol, 3 eq), copper(I) iodide (220.4mg, 1.17 mmol, 0.05 eq) and 1-butylimidazole (2.9 g, 23.3 mmol, 1.0 eq)were added to a 250-ml round flask and dissolved in toluene (100 ml).After adding 3-bromobenzene (3.66 g, 23.3 mmol, 1.0 eq), a refluxapparatus was installed, which was heated to 120° C., and the reactionallowed to proceed under stirring. When the reaction was completed, thereaction was stopped with saturated aqueous NaHCO₃ solution and workedup with water and ethyl acetate. The organic layer was separated, driedover MgSO₄ and then filtered. Subsequently, the solvent was removed witha rotary vacuum evaporator. The resulting crude material was purified bycolumn chromatography to obtain Compound 4-1.

2) Preparation of Intermediate 4-2

Intermediate 4-1 (10 g, 19.78 mmol, 1.0 eq), potassium carbonate (8.20g, 59.36 mmol, 3 eq), copper(I) iodide (187.1 mg, 0.99 mmol, 0.05 eq)and 1-butylimidazole (2.42 g, 19.78 mmol, 1.0 eq) were added to a 250-mlround flask and dissolved in toluene (100 ml). After adding3-bromobicyclo[4.2.0]octa-1(6),2,4-triene (3.98 g, 21.75 mmol, 1.1 eq),a reflux apparatus was installed, which was heated to 120° C., and thereaction allowed to proceed under stirring. When the reaction wascompleted, the reaction was stopped with saturated aqueous NaHCO₃solution and worked up with water and ethyl acetate. The organic layerwas separated, dried over MgSO₄ and then filtered. The solvent was thenremoved with a rotary vacuum evaporator. The resulting crude materialwas purified by column chromatography to obtain Compound 4-2.

3) Preparation of Compound 4

Intermediate Compound 4-2 (10.0 g, 16.46 mmol, 2.05 eq),N4,N4′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (2.70 g, 8.03 mmol, 1.0eq), NaOtBu (2.70 g, 28.10 mmol, 3.5 eq), and Pd(PtBu₃)₂ (205.2 mg, 0.40mmol, 0.05 eq) were dissolved in toluene (90 ml) in a 250-ml roundflask, then stirred and reacted under a nitrogen atmosphere.Subsequently, after completion of the reaction, it was worked-up withwater and ethyl acetate, and the organic layer was separated, dried andthen filtered. Then, the solvent was removed with a rotary vacuumevaporator. The resulting crude material was purified by columnchromatography and the solvent was removed to obtain Compound 4 (whitesolid).

1H NMR (500 MHz): δ 7.88-7.85 (m, 4H), 7.57-7.55 (m, 6H), 7.52-7.30 (m,20H), 7.27-7.15 (m, 18H), 7.07-6.90 (m, 16H), 2.85 (s, 8H)

Preparation Example 5: Preparation of Compound 5

1) Preparation of Intermediate 5-1

2-Bromo-9H-fluoren-9-one (15 g, 57.9 mmol, 1.0 eq) and phenol (54.5 g,579 mmol, 10.0 eq) were added to a 250-ml round flask and dissolved inmethanesulfonic acid (70 ml, 0.8 M). The mixture was stirred at 60° C.overnight. Then, water was poured to terminate the reaction, and theresulting precipitate was washed with water and filtered. The obtainedfiltrate was dissolved in a small amount of ethyl acetate and droppedinto hexane to proceed the precipitation process. Filtration yieldedIntermediate Compound 5-1 as a white solid.

2) Preparation of Intermediate 5-2

Intermediate 5-1 (10 g, 23.29 mmol, 1.0 eq) and cesium carbonate (9.1 g,27.95 mmol, 1.2 eq) were dissolved in dimethylformamide (50 ml, 0.47 M)in a 250-ml round flask, then heated to 100° C. and stirred. Then,2-ethylhexyl bromide (3.71 ml, 20.96 mmol, 0.9 eq) was slowly addedthereto and stirred. When the reaction was completed, the reactionmixture was cooled to room temperature, and water was added to stop thereaction. The organic layer was then extracted using ethyl acetate. Theorganic layer was separated, dried over magnesium sulfate, and then thesolvent was removed and purified by column chromatography to obtainIntermediate Compound 5-2.

3) Preparation of Intermediate 5-3

Intermediate 5-2 (10 g, 15.5 mmol, 1.0 eq), potassium carbonate (6.4 g,46.6 mmol, 3 eq), copper(I) iodide (147.6 mg, 0.78 mmol, 0.05 eq) and1-butylimidazole (1.9 g, 15.5 mmol, 1.0 eq) were added to a 250-ml roundflask and dissolved in toluene (77 ml). After the reflux apparatus wasinstalled, the mixture was heated to 120° C. and the reaction allowed toproceed under stirring. When the reaction was completed, the reactionwas stopped with saturated aqueous NaHCO₃ solution and worked up withwater and ethyl acetate. The organic layer was separated, dried overMgSO₄ and then filtered. Then, the solvent was removed with a rotaryvacuum evaporator. The resulting crude material was purified by columnchromatography to obtain Compound 5-3.

4) Preparation of Intermediate 5

Intermediate Compound 5-3 (10.0 g, 15.54 mmol, 2.05 eq),N4,N4′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (2.55 g, 7.58 mmol, 1.0eq), NaOtBu (2.55 g, 26.53 mmol, 3.5 eq) and Pd(PtBu₃)₂ (194 mg, 0.38mmol, 0.05 eq) were dissolved in toluene (90 ml) in a 250-ml roundflask, then stirred and reacted under a nitrogen atmosphere.Subsequently, after completion of the reaction, it was worked-up withwater and ethyl acetate, and the organic layer was separated, dried andthen filtered. Then, the solvent was removed with a rotary vacuumevaporator. The resulting crude material was purified by columnchromatography and the solvent was removed to obtain Compound 5 (whitesolid).

1H NMR (500 MHz): δ 7.90-7.85 (m, 4H), 7.55-7.52 (m, 6H), 7.48-7.26 (m,22H), 7.24-7.05 (m, 10H), 6.95-6.93 (d, 4H), 6.86-6.84 (d, 4H),3.98-3.97 (m, 2H), 3.73-3.70 (m, 2H), 2.90 (s, 8H), 1.70-1.67 (m, 2H),1.55-1.52 (m, 4H), 1.32-1.25 (m, 12H), 0.95-0.92 (t, 6H), 0.90-0.88 (t,6H)

Preparation Example 6: Preparation of Compound 6

1) Preparation of Intermediate 6-1

4-(2-Bromo-9-(4-((2-ethylhexyl)oxy)phenyl)-9H-fluoren-9-yl)phenol (15 g,27.7 mmol, 1.0 eq) and potassium carbonate (11.5 g, 83.1 mmol, 3 eq)were added to a 250-ml round flask and dissolved in DMF (150 ml).3-(Bromomethyl)-3-ethyloxetane (5.5 g, 30.5 mmol, 1.1 eq) was addedthereto, and the mixture was heated at 70° C. and the reaction allowedto proceed under stirring. After completion of the reaction, it wasworked-up with water and ethyl acetate. The organic layer was separated,dried over MgSO₄ and then filtered. Then, the solvent was removed with arotary vacuum evaporator. The resulting crude material was purified bycolumn chromatography to obtain Compound 6-1.

2) Preparation of Compound 6

Intermediate Compound 6-1 (10.0 g, 15.63 mmol, 2.05 eq),N4,N4′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (2.56 g, 7.62 mmol, 1.0eq), NaOtBu (2.56 g, 26.67 mmol, 3.5 eq) and Pd(PtBu₃)₂ (194.7 mg, 0.38mmol, 0.05 eq) were dissolved in toluene (100 ml) in a 250-ml roundflask, then stirred and reacted under a nitrogen atmosphere.Subsequently, after completion of the reaction, it was worked-up withwater and ethyl acetate, and the organic layer was separated, dried andthen filtered. Then, the solvent was removed with a rotary vacuumevaporator. The resulting crude material was purified by columnchromatography and the solvent was removed to obtain Compound 6 (whitesolid).

1H NMR (500 MHz): δ 7.91-7.95 (m, 4H), 7.56-7.53 (m, 6H), 7.45-7.20 (m,30H), 6.87-6.83 (m, 8H), 4.37-4.35 (d, 4H), 4.13-4.10 (d, 4H), 3.94-3.90(m, 2H), 3.80 (s, 2H), 3.75-3.71 (m, 2H), 1.80-1.78 (m, 2H), 1.70-1.68(q, 4H), 1.55-1.53 (m, 4H), 1.30-1.18 (m, 12H), 0.99-0.96 (t, 6H),0.88-0.84 (m, 12H)

EXAMPLE Example 1

Compound 1 (1.6 wt %) prepared in Preparation Example 1 and thefollowing Compound A (0.4 wt %) as a functional material, Triton X-45(0.1 wt %) as an additive, and TEGBE (Triethylene glycol monobutylether; 97.9 wt %) as a solvent were mixed and stirred to prepare an inkcomposition.

Examples 2 to 55 and Comparative Examples 1 to 20

An ink composition was prepared in the same manner as in Example 1,except that each component contained in the ink composition was used asshown in Tables 1 to 6 below. On the other hand, in Tables 1 to 6, eachabbreviation of the solvents has the following meaning, and thecompounds B and C are as follows.

TEGBE: Triethylene glycol monobutyl ether

6-MTN: 6-methoxytetrahydronaphthalene

DEGDBE: Diethylene glycol dibutyl ether

tetEGDME: tetraethylene glycol dimethyl ether

EXPERIMENTAL EXAMPLE

The properties of the ink compositions prepared in Examples andComparative Examples were evaluated through the following experiments.

1) Solubility: In the ink compositions prepared in Examples andComparative Examples, if the compounds of Chemical Formulas 1 to 6 wasdissolved at 1.0 wt % or more, respectively, at room temperature (23°C.), they were evaluated as O.K, and if the compounds were dissolved at0.5 wt % or less, they were evaluated as N.G.

2) Film image: The ink compositions prepared in Examples and ComparativeExamples were injected into the head of a Dimatix Materials Cartridge(FUJIFILM), and ink droplets were discharged by nine drops on each pixel(see FIG. 1). Subsequently, the solvent was removed by vacuum drying toform an ink film. The ink film was cured by heat treatment for 30minutes on a 230° C. hot plate. With respect to the ink film thusprepared, if no foreign matters such as grains, glittering points, whitepoints, etc. within pixels are observed as a film image (confirmed by anoptical microscope) (see FIG. 2), it was evaluated as O.K, and if not so(see FIG. 3), it was evaluated as N.G.

3) Jetting properties: In the previous film image evaluation, when allnozzles were discharged without clogging for at least 5 minutes and theink was discharged to have a straightness, it was evaluated as O.K, andif there was no discharge or the ink drop was ejected into a crooked orzigzag shape at the time of discharge, it was evaluated as N.G.

4) Film flatness: As shown in FIG. 4, the ink composition prepared inExamples and Comparative Examples was discharged in a bank, vacuum-driedto remove the solvent, and then the ink film profile was observed(confirmed by the optical profiler, using Zygo equipment). At this time,the ink was formed to have a thickness of 50 nm to 80 nm. Then, if thevalue of (|H_(edge)−H_(center)|/H_(center)) was less than 0.25, it wasevaluated as O.K, and if the value was 0.25 or more, it was evaluated asN.G.

The above results are shown in Tables 1 to 6 below.

TABLE 1 Functional Film Jetting Film material Solvent AdditiveSolubility image properties flatness Example 1 Compound TEGBE TritonX-4.5 O.K O.K O.K O.K 1 + Compound A Example 2 Compound TEGBE TritonX-114 O.K O.K O.K O.K 1 + Compound A Example 3 Compound TEGBE IGEPAL ®O.K O.K O.K O.K 1 + Compound A CO-630 Example 4 Compound TEGBE Brij ®C10 O.K O.K O.K O.K 1 + Compound A Example 5 Compound TEGBE Brij ® S10O.K O.K O.K O.K 1 + Compound A Example 6 Compound TEGBE + Triton X-100O.K O.K O.K O.K 1 + Compound A 6-MTN Example 7 Compound DEGDBE TritonX-100 O.K O.K O.K O.K 1 + Compound A Example 8 Compound TEGBE TritonX-100 O.K O.K O.K O.K 1 + Compound B Example 9 Compound DEGBE TritonX-45 O.K O.K O.K O.K 1 + Compound C Comparative Compound TEGBE X O.K N.GO.K O.K Example 1 1 + Compound A Comparative Compound TEGBE + X O.K N.GO.K O.K Example 2 1 + Compound A 6-MTN Comparative Compound DEGDBE X O.KN.G O.K O.K Example 3 1 + Compound B Comparative Compound TEGBE X O.KN.G O.K O.K Example 4 1 + Compound C

TABLE 2 Functional Film Jetting Film material Solvent AdditiveSolubility image properties flatness Example 10 Compound TEGBE TritonX-100 O.K O.K O.K O.K 2 + Compound A Example 11 Compound TEGBE IGEPAL ®O.K O.K O.K O.K 2 + Compound A CO-520 Example 12 Compound TEGBE IGEPAL ®O.K O.K O.K O.K 2 + Compound B CO-630 Example 13 Compound TEGBE TritonX-45 O.K O.K O.K O.K 2 + Compound B Example 14 Compound TEGBE Brij ® S10O.K O.K O.K O.K 2 + Compound B Example 15 Compound DEGBE Triton X-100O.K O.K O.K O.K 2 + Compound B Example 16 Compound TEGBE Triton X-45 O.KO.K O.K O.K 2 + Compound C Example 17 Compound TEGBE Triton X-100 O.KO.K O.K O.K 2 + Compound C Example 18 Compound TEGBE + Brij ® C10 O.KO.K O.K O.K 2 + Compound C 6-MTN Comparative Compound DEGDBE X O.K N.GO.K O.K Example 5 2 + Compound A Comparative Compound TEGBE X O.K N.GO.K O.K Example 6 2 + Compound B Comparative Compound TEGBE X O.K N.GO.K O.K Example 7 2 + Compound C

TABLE 3 Functional Film Jetting Film material Solvent AdditiveSolubility image properties flatness Example 19 Compound TEGBE TritonX-45 O.K O.K O.K O.K 3 + Compound A Example 20 Compound TEGBE IGEPAL ®O.K O.K O.K O.K 3 + Compound B CO-520 Example 21 Compound TEGBE IGEPAL ®O.K O.K O.K O.K 3 + Compound B CO-630 Example 22 Compound TEGBE TritonX-45 O.K O.K O.K O.K 3 + Compound B Example 23 Compound TEGBE Brij ® C10O.K O.K O.K O.K 3 + Compound B Example 24 Compound tetEGDME Triton X-100O.K O.K O.K O.K 3 + Compound C Example 25 Compound TEGBE Triton X-45 O.KO.K O.K O.K 3 + Compound C Example 26 Compound TEGBE Triton X-100 O.KO.K O.K O.K 3 + Compound C Example 27 Compound TEGBE + Triton X-114 O.KO.K O.K O.K 3 + Compound C 6-MTN Example 28 Compound DEGDBE IGEPAL ® O.KO.K O.K O.K 3 + Compound A CO-630 Comparative Compound TEGBE X O.K N.GO.K O.K Example 8 3 + Compound A Comparative Compound TEGBE X O.K N.GO.K O.K Example 9 3 + Compound B Comparative Compound tetEGDME X O.K N.GO.K O.K Example 10 3 + Compound C

TABLE 4 Functional Film Jetting Film material Solvent AdditiveSolubility image properties flatness Example 29 Compound DEGDBE TritonX-45 O.K O.K O.K O.K 4 + Compound A Example 30 Compound DEGDBE IGEPAL ®O.K O.K O.K O.K 4 + Compound A CO-520 Example 31 Compound TEGBE IGEPAL ®O.K O.K O.K O.K 4 + Compound B CO-720 Example 32 Compound TEGBE Brij ®C10 O.K O.K O.K O.K 4 + Compound B Example 33 Compound DEGDBE TritonX-45 O.K O.K O.K O.K 4 + Compound B Example 34 Compound tetEGDME TritonX-100 O.K O.K O.K O.K 4 + Compound B Example 35 Compound DEGDBE TritonX-45 O.K O.K O.K O.K 4 + Compound C Example 36 Compound DEGDBE TritonX-100 O.K O.K O.K O.K 4 + Compound C Example 37 Compound TEGBE + TritonX-114 O.K O.K O.K O.K 4 + Compound C 6-MTN Comparative Compound DEGDBE XO.K N.G O.K O.K Example 11 4 + Compound A Comparative Compound TEGBE XO.K N.G O.K O.K Example 12 4 + Compound B Comparative Compound TEGBE XO.K N.G O.K O.K Example 13 4 + Compound C

TABLE 5 Functional Film Jetting Film material Solvent AdditiveSolubility image properties flatness Example 38 Compound TEGBE Triton X-45 O.K O.K O.K O.K 5 + Compound A Example 39 Compound TEGBE IGEPAL ® O.KO.K O.K O.K 5 + Compound B CO-520 Example 40 Compound TEGBE IGEPAL ® O.KO.K O.K O.K 5 + Compound B CO-630 Example 41 Compound TEGBE Triton X-45O.K O.K O.K O.K 5 + Compound B Example 42 Compound TEGBE Brij ® C10 O.KO.K O.K O.K 5 + Compound B Example 43 Compound tetEGDME Triton X-100 O.KO.K O.K O.K 5 + Compound C Example 44 Compound TEGBE Triton X-45 O.K O.KO.K O.K 5 + Compound C Example 45 Compound TEGBE Triton X-100 O.K O.KO.K O.K 5 + Compound C Example 46 Compound TEGBE + Triton X-114 O.K O.KO.K O.K 5 + Compound C 6-MTN Comparative Compound TEGBE X O.K N.G O.KO.K Example 14 5 + Compound A Comparative Compound TEGBE X O.K N.G O.KO.K Example 15 5 + Compound B Comparative Compound tetEGDME X O.K N.GO.K O.K Example 16 5 + Compound C

TABLE 6 Functional Film Jetting Film material Solvent AdditiveSolubility image properties flatness Example 47 Compound TEGBE TritonX-114 O.K O.K O.K O.K 6 + Compound A Example 48 Compound TEGBE IGEPAL ®O.K O.K O.K O.K 6 + Compound A CO-720 Example 49 Compound TEGBE IGEPAL ®O.K O.K O.K O.K 6 + Compound A CO-630 Example 50 Compound TEGBE TritonX-45 O.K O.K O.K O.K 6 + Compound B Example 51 Compound TEGBE Brij ® O10O.K O.K O.K O.K 6 + Compound B Example 52 Compound tetEGDME Triton X-45O.K O.K O.K O.K 6 + Compound C Example 53 Compound TEGBE Triton X-45 O.KO.K O.K O.K 6 + Compound C Example 54 Compound TEGBE + Triton X-114 O.KO.K O.K O.K 6 + Compound C 6-MTN Example 55 Compound DBE Triton X-45 O.KO.K O.K O.K 6 + Compound C Comparative Compound DEGDBE X O.K N.G O.K O.KExample 17 6 + Compound A Comparative Compound TEGBE X O.K N.G O.K O.KExample 18 6 + Compound A Comparative Compound TEGBE X O.K N.G O.K O.KExample 19 6 + Compound B Comparative Compound TEGBE + X O.K N.G O.K O.KExample 20 6 + Compound C 6-MTN

The invention claimed is:
 1. An ink composition for an organic lightemitting device comprising: a compound represented by the followingChemical Formula 1, a compound represented by the following ChemicalFormula 2, and a solvent:

in Chemical Formula 1, L and L₁ to L₄ are each independently asubstituted or unsubstituted C₆₋₆₀ arylene, Ar₁ and Ar₂ are eachindependently a substituted or unsubstituted C₆₋₆₀ aryl, R₁ to R₄ areeach independently hydrogen, deuterium, a substituted or unsubstitutedC₁₋₆₀ alkyl, a substituted or unsubstituted C₁₋₆₀ alkoxy, a substitutedor unsubstituted C₆₋₆₀ aryl, or a substituted or unsubstituted C₂₋₆₀heteroaryl containing one or more heteroatoms selected from the groupconsisting of N, O and S, Y₁ to Y₄ are each independently hydrogen, or—X-A, with the proviso that two or more of Y₁ to Y₄ are —X-A, X is O orS, A is a functional group which can be crosslinked by heat or light, n1and n4 are each an integer of 0 to 4, n2 and n3 are each an integer of 0to 3,

in Chemical Formula 2, R is C₃₋₆₀ alkyl; C₃₋₆₀ alkenyl; or phenylsubstituted with C₃₋₆₀ alkyl, and n is an integer of 4 to
 20. 2. The inkcomposition according to claim 1, wherein A is any one selected from thegroup consisting of the following:

wherein, T₁ is hydrogen; or a substituted or unsubstituted C₁₋₆₀ alkyl,and T₂ to T₄ are each independently a substituted or unsubstituted C₁₋₆alkyl.
 3. The ink composition according to claim 1, wherein the ChemicalFormula 1 is represented by any one of the following Formulas 1-1 to1-4:

in Chemical Formulas 1-1 to 1-4, R₁ to R₄, n1 to n4, Ar₁, Ar₂ and L areas defined in Chemical Formula 1 of claim 1, X₁ to X₄ are eachindependently O or S, A₁ to A₄ are each independently a functional groupthat can be crosslinked by heat or light, R₂₁ to R₂₆ are eachindependently hydrogen, deuterium, a substituted or unsubstituted C₁₋₆₀alkyl, a substituted or unsubstituted C₁₋₆₀ alkoxy, a substituted orunsubstituted C₆₋₆₀ aryl, or a substituted or unsubstituted C₂₋₆₀heteroaryl containing any one or more heteroatoms selected from thegroup consisting of N, O and S, and p1 and p2 are each an integer of 0to 5, p3 and p4 are each an integer of 0 to 4, and p5 and p6 are each aninteger of 0 to
 7. 4. The ink composition according to claim 1, whereinL is the following Chemical Formula 1-A or 1-B:

in Chemical Formulas 1-A and 1-B, R₁₁ to R₁₃ are each independentlyhydrogen, deuterium, a substituted or unsubstituted C₁₋₆₀ alkyl, asubstituted or unsubstituted C₁₋₆₀ alkoxy, a substituted orunsubstituted C₆₋₆₀ aryl, or a substituted or unsubstituted C₂₋₆₀heteroaryl containing any one or more heteroatoms selected from thegroup consisting of N, O and S, and m1 to m3 are each an integer of 0 to4.
 5. The ink composition according to claim 1, wherein the ChemicalFormula 1 is any one selected from the group consisting of thefollowing:


6. The ink composition according to claim 1, wherein R is C₁₀₋₂₀ alkyl;C₁₀₋₂₀ alkenyl; or phenyl substituted with C₁₀₋₂₀ alkyl.
 7. The inkcomposition according to claim 1, wherein the compound represented byChemical Formula 2 is included in an amount of 0.05 to 1% by weightrelative to the total weight of the ink composition.
 8. The inkcomposition according to claim 1, wherein the solvent has a boilingpoint of 180° C. or more.
 9. The ink composition according to claim 1,wherein the solvent is aliphatic esters, aromatic esters, aliphaticethers, aromatic ethers, aliphatic hydrocarbons, aromatic hydrocarbons,aliphatic alcohols, aromatic alcohols, or glycol ethers.
 10. The inkcomposition according to claim 1, wherein the solvent is triethyleneglycol monobutyl ether, diethylene glycol dibutyl ether, tetraethyleneglycol dimethyl ether, tetraethylene glycol n-butyl ether, triethyleneglycol monoisopropyl ether, diethylene glycol monohexyl ether,triethylene glycol monomethyl ether, diethylene glycol monobutyl etheracetate, diethylene glycol monoisobutyl ether, dipropylene glycoln-butyl ether, 3-phenoxytoluene, dibenzyl ether,bis(methoxymethyl)benzene, isoamylbenzoate, isoamyl octanoate,decylbenzene, 1-methoxynaphthalene, phenethyl octanoate,1,3-dimethoxybenzene, ethyl 4-methoxybenzoate, hexyl benzoate,1-ethylnaphthalene, cyclohexylbenzene, octylbenzene, 2-ethylnaphthalene,benzyl butyrate, p-anisaldehyde dimethyl acetal, 3-phenyl-1-propanol,p-propylanisole, ethyl benzoate, butyl phenyl ether,3,4-dimethylanisole, ethylene glycol monobenzyl ether, diethylene glycolmonophenyl ether, dibutyl oxalate, or 3-phenoxybenzyl alcohol.
 11. Theink composition according to claim 1, further comprising a p-type dopingmaterial.
 12. The ink composition according to claim 11, wherein thep-type doping material is represented by any one of the followingChemical Formulas A to H: